Could the slants be related to time periods? like maybe first the up slants came out then the down slants later?I don't know how to check the dates on that, I don't have any of those bottles.
http://archive.org/stream/annualreportofau1922nort/annualreportofau1922nort_djvu.txt SUPPOSED TO BE SOMETHING IN HERE ABOUT THE LIME COLA COMPANY OF SOUTH CAROLINA,MY EYES STARTED CROSSING THOUGH :)